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Question
A man can do a piece of work in 5 days. But with the help of his son, he can do it in 3 days . In what time can the son do it alone ?
6.5 days
7 days
7.5 days
8 days
ANSWER : 3
Descrption
<p>Man can do in 1 days = 1/5 portion</p> <p>Man + son can do in 1 days = 1/3 portion</p> <p>Man can do alone in 1 days = ( 1/3 - 1/5) portion = 2/15 portion</p> <p>2/15 portion can be done in 1 days</p> <p>1 (hole) can be done in = 15/2 days = 7.5 days </p>
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